Step-Down Butt Splices | McMaster-Carr

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36 Products

Heat-Shrink Reducing Crimp-On Butt Splices

When heat is applied, adhesive-lined insulation shrinks and bonds to the wires, creating a watertight seal. Use these splices to connect two wires of different sizes—one end of the splice is larger than the other. They are color-coded according to the larger wire gauge size and have a colored stripe to indicate the size of the smaller end.

For technical drawings and 3-D models, click on a part number.

For Wire Gauge	Lg.	Color	Insulation Material	Terminal Material	Shrink Temperature, °F	Max. Voltage	Max. Temperature, °F	Pkg. Qty.		Pkg.
22-18 × 24-22	1.6"	Red with Red Stripe	Polyolefin Plastic	Tin-Plated Copper	275°	600V AC 600V DC	220°	10	0000000	000000
16-14 × 22-18	1.6"	Blue with Red Stripe	Nylon Plastic	Tin-Plated Copper	195°	600V AC 600V DC	220°	10	0000000	00000
12-10 × 16-14	1.8"	Yellow with Blue Stripe	Nylon Plastic	Tin-Plated Copper	195°	600V AC 600V DC	220°	5	0000000	00000
8 × 12-10	1.8"	Red with Red Stripe and Yellow Stripe	Polyolefin Plastic	Tin-Plated Copper	275°	600V AC	220°	10	0000000	00000

Heat-Shrink Reducing Crimp-On Butt Splices with Inspection Window

Check to make sure you’ve made a secure connection between two different sizes of wire with the inspection window on these splices. When heated, their adhesive-lined insulation shrinks and bonds to wires, creating a water- and corrosion-resistant seal. They have colored stripes to help differentiate end sizes, so you can easily match your wire to the right end.

For technical drawings and 3-D models, click on a part number.

For Wire Gauge	Lg.	Color	Insulation Material	Terminal Material	Shrink Temperature, °F	Max. Voltage	Max. Temperature, °F	Pkg. Qty.		Pkg.
22-18 × 24-22	1.47"	Clear with Red Stripe and White Stripe	Plastic	Tin-Plated Copper	190°	600V AC 600V DC	255°	10	0000000	000000
16-14 × 22-18	1.47"	Clear with Blue Stripe and Red Stripe	Plastic	Tin-Plated Copper	190°	600V AC 600V DC	255°	10	0000000	00000
12-10 × 16-14	1.59"	Clear with Blue Stripe and Yellow Stripe	Plastic	Tin-Plated Copper	190°	600V AC 600V DC	255°	10	0000000	00000
8 × 12-10	1.59"	Clear with Red Stripe and Yellow Stripe	Plastic	Tin-Plated Copper	190°	600V AC 600V DC	255°	10	0000000	00000

Solder-Loaded Heat-Shrink Reducing Crimp-On Butt Splices

Create a water- and corrosion-resistant seal while connecting two different sizes of wire. When these splices are heated, the solder inside melts and the adhesive liner shrinks and bonds to form the seal. Because of this seal, these splices are the most secure, electrically conductive splices we offer that connect two different sizes of wire. All have a stripe on the smaller end that’s a different color than the body, so you can easily match your wire to the right connector.

For technical drawings and 3-D models, click on a part number.

For Wire Gauge	Length	Color	Insulation Material	Terminal Material	Shrink Temperature, °F	Maximum Voltage	Maximum Temperature, °F	Pkg. Qty.		Pkg.
22-18 × 26-22	1.5"	Red with Red Stripe and White Stripe	Polyolefin Plastic	Tin-Plated Copper	275°	600V AC 600V DC	230°	10	0000000	000000
16-14 × 22-18	1.5"	Blue with Blue Stripe and Red Stripe	Polyolefin Plastic	Tin-Plated Copper	275°	600V AC 600V DC	230°	10	0000000	00000
12-10 × 16-14	1.5"	Yellow with Blue Stripe and Yellow Stripe	Polyolefin Plastic	Tin-Plated Copper	275°	600V AC 600V DC	230°	10	0000000	00000
8 × 12-10	1.75"	Pink with Pink Stripe and Yellow Stripe	Polyolefin Plastic	Tin-Plated Copper	275°	600V AC 600V DC	230°	10	0000000	00000

Noninsulated Reducing Crimp-On Butt Splices

These splices can withstand higher temperatures than insulated splices. Use them to connect two wires of different sizes. They have colored stripes to help differentiate end sizes, so you can easily match your wire to the right end.

For technical drawings and 3-D models, click on a part number.

For Wire Gauge	Lg.	Color	Terminal Material	Max. Voltage	Max. Temperature, °F	Specifications Met	Pkg. Qty.		Pkg.
22-18 × 26-24	0.7"	Gray with White and Red Stripe	Tin-Plated Copper	600V AC 600V DC	345°	__	25	0000000	00000
16-14 × 22-18	0.7"	Gray with Red Stripe	Tin-Plated Copper	Not Rated	300°	UL Listed, CSA Certified	10	000000	0000
12-10 × 22-18	0.8"	Gray with Yellow and Red Stripe	Tin-Plated Copper	600V AC 600V DC	345°	UL Listed, C-UL Listed	10	0000000	0000
12-10 × 16-14	0.8"	Gray with Blue Stripe	Tin-Plated Copper	Not Rated	300°	UL Listed, CSA Certified	10	000000	0000
8 × 16-14	0.8"	Gray with Red and Blue Stripe	Tin-Plated Copper	600V AC 600V DC	345°	UL Listed, C-UL Listed	10	0000000	00000
8 × 12-10	0.9"	Gray with Yellow Stripe	Tin-Plated Copper	Not Rated	300°	UL Listed, CSA Certified	10	000000	00000
6 × 8	1.1"	Gray with Red Stripe	Tin-Plated Copper	Not Rated	300°	UL Listed, CSA Certified	10	000000	00000

Insulated Reducing Crimp-On Butt Splices

A plastic cover fully insulates these splices. Use them to connect two wires of different sizes—one end of the splice is larger than the other. They are color-coded according to the larger wire gauge size and have a colored stripe to indicate the size of the smaller end.

For technical drawings and 3-D models, click on a part number.

For Wire Gauge	Lg.	Color	Insulation Material	Terminal Material	Max. Voltage	Max. Temperature, °F	Pkg. Qty.		Pkg.
16-14 to 22-18	1.1"	Blue with Red Stripe	Vinyl Plastic	Tin-Plated Copper	600V DC	220°	10	0000000	000000
12-10 to 16-14	1.3"	Yellow with Blue Stripe	Vinyl Plastic	Tin-Plated Copper	600V DC	220°	10	0000000	00000
8 to 12-10	1.5"	Red with Yellow Stripe	Vinyl Plastic	Tin-Plated Copper	600V DC	220°	10	0000000	00000
6 to 8	1.8"	Blue with Red Stripe	Vinyl Plastic	Tin-Plated Copper	600V DC	220°	5	0000000	00000

Reducing Compression Butt Splices

Connect two different sizes of wire. These splices are color coded to match compression dies and marked with die reference numbers and wire sizes. A center stop keeps wire at the correct depth. Use these splices with a compression tool (not included).

For technical drawings and 3-D models, click on a part number.

For Wire Gauge	Lg.	Color	For Wire Type	Terminal Material	Max. Voltage	Max. Temperature, °F	Specifications Met		Each
4 × 6	1.95"	Gray × Blue	Stranded	Tin-Plated Copper	600V AC	190°	UL Listed, C-UL Listed	0000000	00000
2 × 6	2.11"	Brown × Blue	Stranded	Tin-Plated Copper	600V AC	190°	UL Listed, C-UL Listed	0000000	0000
2 × 4	2.06"	Brown × Gray	Stranded	Tin-Plated Copper	600V AC	190°	UL Listed, C-UL Listed	0000000	0000
1/0 × 6	2.26"	Pink × Blue	Stranded	Tin-Plated Copper	600V AC	190°	UL Listed, C-UL Listed	0000000	0000
1/0 × 4	2.21"	Pink × Gray	Stranded	Tin-Plated Copper	600V AC	190°	UL Listed, C-UL Listed	0000000	00000
2/0 × 6	2.42"	Black × Blue	Stranded	Tin-Plated Copper	600V AC	190°	UL Listed, C-UL Listed	0000000	00000
2/0 × 4	2.36"	Black × Gray	Stranded	Tin-Plated Copper	600V AC	190°	UL Listed, C-UL Listed	0000000	00000
4/0 × 6	2.69"	Purple × Blue	Stranded	Tin-Plated Copper	600V AC	190°	UL Listed, C-UL Listed	0000000	00000
4/0 × 1/0	2.4"	Purple × Pink	Stranded	Tin-Plated Copper	600V AC	190°	UL Listed, C-UL Listed	0000000	00000
4/0 × 2/0	2.35"	Purple × Black	Stranded	Tin-Plated Copper	600V AC	190°	UL Listed, C-UL Listed	0000000	00000

Solder-Loaded Heat-Shrink Wire Splicing Connectors

When you apply heat to these connectors, the solder inside melts to create the most secure, electrically conductive, and environmentally sealed connection we offer. They also have an adhesive-lined insulation that shrinks and bonds to wire when heated, protecting it from water and corrosion.

For technical drawings and 3-D models, click on a part number.

For Wire Gauge	For Wire Type	Color	Insulation Material	Terminal Material	Shrink Temperature, °F	Max. Voltage	Max. Temperature, °F	Specifications Met	Pkg. Qty.		Pkg.
18-14	Stranded	Blue	PVDF Plastic	Copper	824°	600V AC 600V DC	257°	UL Listed, C-UL Listed	5	0000000	000000
14-12	Stranded	Blue	PVDF Plastic	Copper	824°	600V AC 600V DC	257°	UL Listed, C-UL Listed	5	0000000	00000
12-8	Stranded	Blue	PVDF Plastic	Copper	824°	600V AC 600V DC	257°	UL Listed, C-UL Listed	5	0000000	00000